Mr. Thierry Zamofing Profile

Thierry Zamofing

at Univ de Neuchatel

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Proceedings Article | 16 December 2004 Paper

Multiresolution reliability scheme for range image filtering

Thierry Zamofing, Heinz Hugli

Proceedings Volume 5606, (2004) https://doi.org/10.1117/12.580476

KEYWORDS: Image filtering, Reliability, Optical filters, Image resolution, Digital filtering, Image processing, Gaussian filters, Image quality, Cameras, Stereoscopic cameras

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A large number of 3D cameras suffer from so-called holes in the data, i.e. the measurement lattice is affected by invalid measurements and the range image has undefined values. Conventional image filters used for removing the holes perform not well in presence of holes with large varying hole sizes. The novel hole-filling method presented in this paper operates on reliability attributed range images featuring unwanted holes with wide varying sizes. The method operates according to a multi resolution scheme where the image resolution is decreased at the same time as the range reliability is successively increased until sufficient confidence is reached. It builds on three main components. First, the described process performs a weighted local neighbourhood filter where the contribution of each pixel stands for its reliability. Second, the filtering combines filters with different kernel sizes and implements therefore the multi resolution schema. Third, the processing requires a complete travel from high resolution down to the resolution of satisfactory confidence and back again to the highest resolution. The algorithm for the described method was implemented in a efficient way and was widely applied in the hole-filling of range images from a depth from focus process where reliability is obtainable non-linearly from the local sharpness measurement. The method is valid in a very general way for all range imagers providing reliability information. It seems therefore well suited to depth cameras like time-of-flight, stereo and other similar rangers.

Proceedings Article | 26 February 2004 Paper

Applied multifocus 3D microscopy

Thierry Zamofing, Heinz Hugli

Proceedings Volume 5265, (2004) https://doi.org/10.1117/12.518827

KEYWORDS: Microscopy, 3D metrology, Confocal microscopy, Microscopes, Colorimetry, Optical interferometry, Image processing, Cameras, Chromatic aberrations, 3D image processing

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The depth from focus measurement principle relies on the detection of the optimal focusing distance for measuring the depth map of an object and finding its 3D shape. The principle is most effective at microscopic ranges where it is usually found implemented around a z-controlled microscope and sometimes named multifocus 3D microscopy. As such, the method competes with many other 3D measurement methods showing both advantages and disadvantages. Multifocus 3D microscopy is presented and compared to chromatic aberation, confocal microscopy, white light interferometry. Then, this paper discusses two applications of multifocus 3D microscopy for measuring wood respectively metallic parts in the sub-millimeter range. The first application aims at measuring the topography of wood samples for surface quality control. The wood samples surface topography is evaluated with data obtained from both confocal microscopy and multifocus 3D microscopy. The profiles and a standard roughness factor are compared. The second application concerns the measurement of burrs on metallic parts. Possibilities and limits of multifocus 3D microscopy are presented and discussed.

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